Fluid-pressure control.



F. E. MARTIN.

FLUID PRESSURE CONTROL. APPLICATION FILED MAR. 22, 1011.

Patented Sept. 26, 1911.

3 BEEET8-BHIIET 1.

Attorneys F. B. MARTIN.

ID PRESS Patented Sept. 26, 1911.

3 SHEETS-SHEET 2.

' EEMQI QZ Attorneys v F. E. MARTIN. 4 FLUID PRESSURE CONTROL.

Patented Sept. 26, 1911. a sunmssnnm a.

I nventor r Attorneys in the cylinder 1 and a piston .rod 7 is .mounted upon FREDERICK E. MARTIN,

0F BONAMI, LOUISIANA.

FLUID-PRESSURE CONTROL.

Specification of Letters Patent. Patented Sept. 26, 1911- Application filed March 22, 1911. Serial No. 616,286.

To all whom it may concern:

Be it known that I, FREDERICK E.'MART1N, a citizen of theUnited States, residing at Bonami, in the parish of Salcasieu and State of Louisiana, have invented a new and useful Fluid-Pressure Control, of which the following is a specification.

This invention relates to a fluid pressure control and consists in the novel construction and arrangement of its parts as hereinafter .shown, described and claimed.

The' apparatus includes a cylinder in which a piston is mounted for reciprocation, said piston having a rod attached thereto, the end portions of which pass through the ends of the cylinder and the said rod is adapted to be connected with the object to be controlled or moved. A valve casing is located adjacent the cylinder and the cylinder is provided with a number of ports which communicate with the interior of the casing. A valve is slidably mounted in the valve casing and means is provided whereby the said valve may be manually moved with relation to the piston to open the ports beyond one or the other end of the piston whereby the fluid pressure which is in the cylinder at the opposite ends of the piston is for a time rendered unequal thereby causing the said piston to move within the cylinder and follow the valve. In the accompanying drawings :-Figure 1 is a longitudinal sectional view of the fluid pressure control. Fig. 2 is a transverse sectional view of the same cut on the line 2-2 of Fig. 1. Fig. 3 is a transverse sectional view of the same cut on the line 3-8 of Fig. 1. Fig. 4 is a plan view of a portion of the fluid pressure control device. Fig. 5 is a view similar to Fig. 1 showing a modified construction. Fig. 6 is a transverse section on the line 6-6 of Fig. 5. The device consists of a cylinder 1 having steam or other fluid pressure pipes 2 communicating witlnits ends. The pipes 2 are provided with valves 3 which. may be the said pipes at any desired point and the steam or fluid pressure is led tothe said pipes '2 from a common supply pi e 4. The pipe 4 is also provided with a va ve as for instance that indicated at 5 in 1 of the drawings. piston 6 is mounted for reciprocation fixed to the said piston and projects through and beyond the ends of the cylinder 1. It is to duced portion the said piston rod 7 that the object to be controlled or moved is attached. A valve casing 8 is located adjacent the cylinder 1 and the said cylinder 1s provided In its top with a number of ports 9 which communicate both with the interior of the cylinder and the interior of the said valve casing. A slidable valve 9 is mounted in the casing 8 and the said valve at one end is hollow as at 10, which hollow communicates with the interior of the said casing 8 and the casing in turn is provided with an exhaust pipe 11. At a point approximately midway between its ends the valve 9 is provided with a re- 12 and at the end of the said portion 12 the valve 9 is provided with ports 13 which establish communication between the space between the said reduced portion 12 and interior wall of the casing 8 and the hollow 10 provided in the said valve. A stem 14 is attachedto the valve 9- and projects through and beyond one end of the casing 8. A yoke 15 is fixed to the valve stem 14: and the said yoke slidably receives the end portion of the piston rod 7. The said piston rod is provided with spaced stops 16 which are located in the path of movement of the yoke 15 and are adapted to limit sliding movement of the said yoke with relation to the rod 7. A controlling rod 17 is fixed to the yoke 15 and the said controlling rod 17 is adapted to be manually moved or manipulated. When the rod 17 is moved longitudinally and the yoke 15 is moved into enga ement with one of the stops 16 the rod 7 will e moved in the same direction as that in which the rod 17 is moving.

The operation of the device is as Presuming that the parts are in therelative positions as illustrated in Fig. 1 of the draw ings and steam or other fluid pressure is admitted into the opposite ends of the cylinder through the pipes 2 the steam pressure is equalized at the opposite ends of the said cylinder and upon the opposite ends of the piston 6 and consequently the said piston is balanced in its position in the cylinder and will not move longitudinally thereof. Presuming now that it is the desire to have the piston 6 and the rod 7 to which it is attached moved toward the right, an operator gras s the rod 17 and moves the same toward t e right whereby the yoke 15 is caused to slide along the piston rod 7 toward the outermost Sto 16.

yoke 15 moves the valve stem 14. longitudifollows This movement on the part of the hand end of the piston 6 are uncovered and the fluid pressure in the right hand end of' the cylinder 1 escapes through the said uncovered port andflthe space between the reduced portion 12 and the inner surface of the casing 8, the ports 13, the hollow 10 and out through the exhaust 11. This reduces the pressure of the fluid at the right hand end of the cylinder and the excessive pres sure of the fluid at the opposite end of the cylinder will operate upon the piston 6 and move the same toward the right hand end of the cylinder until the said piston covers the lower ends of the ports 9 1n the top of the cylinder which areuncovered by thereduced portion 12 of the valve 9. It of course.

will follow that so long as the rod 17 and the yoke 15 are moved toward the right and the-piston rod 7 follows the said yoke the piston 6 will continue to move toward the right in the cylinder 1 and therefore'it will be seen that by the exercise of comparatively slight manualenergy the expansion of the fluid underpressure is taken advantage of to move a comparatively heavy load throu h the piston and the piston rod. Thus the o ject that is moved is controlled in so far as its location is-concerned.

It is obvious if instead of moving the rod 17 to the right that should the said rod be moved to. the left the reverse of the operation hereinbefore described will take place and-the piston and its rod will be moved toward the left hand'end of the cylinder 1 instead of to the right.

The modified construction illustrated in Figs. 5 and 6 of the drawing is substantially the same as that shown in 1v except that the controlling valve'm echanism is mounted inside the piston and piston rod. 4 indicates the fluid pressure supply pipe and 5 the controlling valve. in place 'ofthe .ad-

justing valve 3 shown in Fig. 1, the branch supply pipes 22 are made smaller in diameter, or constricted, the amount of the constriction dependingupon the degree of pressure which it is desired to supply to opposite sides of the piston. The piston 6 is mounted in the cylinder 1 and has in the central-portion thereof a valve chamber inwh'ich is slidably mounted the valve 9., this valve being controlled by the valve stem 14 'in the same manner as thevalve 9 in Fig. 1. In place of the ports-9' shown-in Fig. 1, the ports 9 and 9 are employed, the port 9 being intended to throw the valve chamber l). into communication with the spac'e at one side of the piston 6 k and the ports 9be mg intended to. throw said valve chamber into communication the space on the opposite side of said piston. The valve 9" the right, the .valve 9 moving therewith. The pressure, of course, exhauststhrough the ports 9 and then through the port 13 in the valve 9*. andrfrontthence through the exhaust passage 11. When the valve 9 has been moved to the right in Fig. 5 by means of? the stem 14', it remains in that position and travels with the piston 6 which continues to move to the right in the cylinder 1 until, the operator moves the valve stem 14, or rather, holds it against further movement with the result that the valve 9 is moved into position to close both the ports 9 and 9", whereupon the piston 6" comes to, a standstill and remains in that position until the valve 9 is again moved. When the parts arein-the position shown in Fig. 5, if the valve stem 14. be moved to the left by means of any suitable handle, the piston 6/ rying with it the valve 9 which through the valve stem 14 causes the operating.han-

dle (not shown) to move continuously to the left, and this leftward movement continues until the operator stops the movement of the valve stem 14 which thus restores the valve 9 to its intermediate position and'causes the valve 6' to come to a standstill and remain in that position.

Having described the invention what I claim as'new and desire to secure by Letters Patent is 1.' A-control-device comprising a cylinder, apiston mounted for reciprocat on thereih,

a pipe, connected to each end of the cylinder for admitting a' fluid pressure element into the cylinder at the opposite ends of the pisimmediately starts toward the left car ton at uniform pressure, and means for rethepressure of the fluid pressure ducing in the cylinder at one endof the element piston-whereby the piston will be forced toward sa'd end of the cylinder on account of the greater pressure at the other end of the piston.

2. A control device comprising a cylinder, a piston mounted for reciprocation in the cylinder, a rod attached to the piston and projecting through the ends of the cylinder,

a PIPGJaIId branch pipes leading therefrom connected to the endsof the cylinder for admitting a fluid pressureelement into the opposite ends" of the cylinder at uniform pressure, a Valve casing. -'located adjacent the cylinder, the cylinder having ports which communicate with: the interior oftt-he .valve the cylinder, the cylinder having ports which low and having ports which communicate connected to the ends of the cylinder for valve casing, a valve slidably mounted in the casing and having at its end an exhaust hollow, the valve being provided with a reduced intermediate portion and having ports which communicate with its hollow and the space between the said reduced portion and the side of the casing, a'yoke fixed with relation to the valve and shdably engaging the piston rod, stops mounted upon the piston rod and adapted to limit the sliding movement of the yoke, and an operating rod attached to the yoke.

5. A control device comprising a cylinder, a piston mounted for reciprocation therein, a pipe connected to each end of the cylinder, for admitting a fluid pressure element at uniform pressure at the ends of the cylinder, a valve casing having ports which communicate with the cylinder a valve located in the casing and adapted when moved to uncover some of said ports to permit the escape of the fluid pressure from one end of the piston and means for moving the valve whereby the pressure in the cylinder will cause the piston to follow the valve and to become locked by the pressure in the cylinder when the movement of the valve ceases.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

FREDERICK E. MARTIN.

Witnesses:

F. B. OCI-ISENREITER, LENA WILLSON.

casing, a valve slidably moun' :d in the valve casing and havlng a reduced intermediate portion and provided with an exhaust holwith the space between the casing and the reduced portion of the said valve and the said exhaust hollow.

3. A control device comprising a cylinder, a piston mounted for reciprocation in the cylinder, a rod attached to the piston and projecting through the ends of the cylinder, a pipe and branch pipes leading therefrom connected to the ends of the cylinder for admitting a fluid pressure element into the opposite ends of the cylinder at uniform pressure, a valve casing located adjacent communicate with the interior of the valve casing, a valve slidably mounted in the easing and adapted when moved to uncover some of the said ports to permit the escape of the fluid pressure from one end of the piston, and means whereby the said valve may be moved manually.

4. A control device comprising a cylinder, a piston mounted for reciprocation in the cylinder, a rod attached to the piston and projecting through the ends of the cylinder, a pipe and branch pipes leading therefrom admitting a fluid pressure element into the opposite ends of the cylinder at uniform pressure, a valve casing located adjacent the cylinder, the said cylinder having ports which communicate with the interior of the 

